#include <stdio.h>
/*
* I_3.c
*
*  Created on: May, 14, 2009
*      Author: yimingliu@fudan.edu.cn
*/

void funI_3_1()
{
	float r,c;
	float p;
	p=3.14;
	scanf("%f",&r);
	c=2*p*r;
	printf("c=%f\n",c);
}

void funI_3_2()
{
	int a,b,c;
	scanf("%d,%d",&a,&b);
	c=a*b;
	printf("%d",c);
}